>> reporter: at one time, stan could have been one of the thousands waiting on line. >> i've been homeless. i've been without money. and without health care. and so, knowing that, and knowing the obstacles that they face, really is the impetus. >> reporter: remote area medical saw 34,000 patients in the u.s. last year, but the clinics only last a few days. there's just not enough time or volunteers to treat everyone. >> when we get to the end of the day on the last day and there's still women out there holding up their kids, just wanting us to see one more, and we have to tell them, i'm sorry, that's -- that's the worst part of this job. what is great, though, is to see somebody that's been in the dental chair, change their lives, really, or got a brand new pair of glasses, and now they can see. >> whoa!